package com.tsn.shiro;

import cn.hutool.http.server.HttpServerRequest;
import cn.hutool.http.server.HttpServerResponse;
import cn.hutool.json.JSONUtil;
import com.tsn.common.Result;
import com.tsn.util.JwtUtils;
import io.jsonwebtoken.Claims;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationToken;

import org.apache.shiro.authc.ExpiredCredentialsException;
import org.apache.shiro.web.filter.authc.AuthenticatingFilter;
import org.apache.shiro.web.util.WebUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * @Author tsn77
 * @Date 2021/7/8 17:06
 * @Version 1.0
 */
@Component
public class JwtFilter extends AuthenticatingFilter {
    @Autowired
    JwtUtils jwtUtils;
    @Override
    protected AuthenticationToken createToken(ServletRequest servletRequest, ServletResponse servletResponse) throws Exception {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        String jwt = request.getHeader("Authorization");
        if(ObjectUtils.isEmpty(jwt))
            return null;
        return new JwtToken(jwt);
    }

    @Override
    protected boolean onAccessDenied(ServletRequest servletRequest, ServletResponse servletResponse) throws Exception {
        HttpServletRequest request= (HttpServletRequest) servletRequest;
        String jwt = request.getHeader("Authorization");
        if(ObjectUtils.isEmpty(jwt))
            return true;
        else
        {
            //校验jwt
            Claims claim = jwtUtils.getClaimByToken(jwt);
            if(claim ==null|| jwtUtils.isTokenExpired(claim.getExpiration())){
                throw  new ExpiredCredentialsException("token已失效，请重新登录");
            }
            //执行登录
        }
        return executeLogin(servletRequest,servletResponse);
    }

    @Override
    protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request, ServletResponse response) {
        HttpServletResponse httpServletResponse= (HttpServletResponse) response;
        Throwable throwable=e.getCause() ==null ? e :e.getCause();
        Result result = Result.failure(throwable.getMessage());
        String json= JSONUtil.toJsonStr(result);
        try {
            httpServletResponse.getWriter().println(json);
        }catch (IOException ioException){

        }

        return false;
    }

    @Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {



        HttpServletRequest httpServletRequest = WebUtils.toHttp(request);
        HttpServletResponse httpServletResponse = WebUtils.toHttp(response);
        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
        // 跨域时会首先发送一个OPTIONS请求，这里我们给OPTIONS请求直接返回正常状态
        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
            httpServletResponse.setStatus(org.springframework.http.HttpStatus.OK.value());
            return false;
        }
        return super.preHandle(request, response);

    }
}
